Fixes header translation between SpdyHeaderBlock and other data structures. Not protected.

Fixes header translation between SpdyHeaderBlock and other data structures. Not protected.

In SPDY, header fields with multiple values are represented in a SpdyHeaderBlock by joining the multiple values together with a null character. This change fixes QUIC-specific utilities that work with SpdyHeaderBlocks.

Merge internal change: 121373674

R=rch@chromium.org
BUG=

[Ryan Hamilton, 2016-05-13 04:27:33]

lgtm

[Buck, 2016-05-13 20:31:10]

The CQ bit was checked by ckrasic@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-05-13 20:32:06]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1976473003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1976473003/1

[commit-bot: I haz the power, 2016-05-13 21:23:02]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-05-13 21:23:05]

Dry run: Try jobs failed on following builders:
  win_chromium_x64_rel_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)